The non-stoichiometric compound \( \mathrm{Fe}_{0.94}\mathrm{O} \) is formed when \( x\% \) of \( \mathrm{Fe}^{2+} \) ions are replaced by as many \( \dfrac{2}{3} \mathrm{Fe}^{3+} \) ions.
The value of \( x \) is:
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Non-stoichiometry in metal oxides arises due to variable oxidation states.